Optics: measuring and testing – By configuration comparison – With photosensitive film or plate
Patent
1978-01-09
1979-04-17
Corbin, John K.
Optics: measuring and testing
By configuration comparison
With photosensitive film or plate
101349, 250239, 356432, 356244, G01B 1106
Patent
active
041498020
ABSTRACT:
A device for measuring ink film thickness in the inking system of a printing press which includes a pair of hollow transparent rollers, at least one of which is resilient so that when the rollers are in rolling engagement with one another and with an ink-carrying roller in the press, there is a longitudinally extending ribbon-like area of engagement between them through which an enclosed film of ink is fed in a thickness which varies in accordance with the thickness of the ink film in the press. A longitudinally extensive light projector in one of the rollers cooperates with a correspondingly dimensioned light collector in the other, the collector being coupled to a photocell having an output indicator. The projector and collector are both in the form of optical cross section transformers, the projector being coupled fiber-optically to an external light source. A filter assembly is interposed in the light path manually switchable for application, to the film, of light of complementary color. A logarithmic amplifier is used having an attenuator, coupled to the switch, for affecting the light level to compensate for differences in inherent opacity of the differently colored inks thereby to enable the indicator to respond directly in terms of film thickness regardless of color.
REFERENCES:
patent: 3289581 (1966-12-01), Roozee
patent: 3577163 (1971-05-01), Riffe
patent: 3857485 (1974-12-01), Frank
patent: 4115009 (1978-09-01), Zepp et al.
Dorn Alfred
Schniggenfittig Gunther
Schoneberger Edgar F.
Schramm Peter
Wolf Klaus
Corbin John K.
Punter William H.
Roland Offsetmaschinenfabrik Faber & Schleicher AG
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